[release/10.0] Ignore re-typed lcl in optAssertionPropLocal_RelOp#119813
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JulieLeeMSFT merged 3 commits intorelease/10.0from Sep 24, 2025
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[release/10.0] Ignore re-typed lcl in optAssertionPropLocal_RelOp#119813JulieLeeMSFT merged 3 commits intorelease/10.0from
JulieLeeMSFT merged 3 commits intorelease/10.0from
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PTAL @AndyAyersMS backport to 10.0 |
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Backport of #119797 to release/10.0
/cc @EgorBo
Customer Impact
In certain patterns involving downcasting long to int JIT could fold branches where it was not legal leading to silent codegen bugs. In case of the customer's repro that was an unexpected IndexOutOfBoundsException thrown.
Regression
It doesn't reproduce on .NET 9.0, but it looks like the actual regression was introduced long time ago and some unrelated change just uncovered it in 10.0.
Testing
Customer's scenario is tested locally and a small test is added
Risk
Low, the change just makes an optimization slightly more conservative